Why is Filter::Simple in core distribution?

Reviewing older RT tickets tonight, I came across this one filed in
January 2012 which has yet to receive a response:
https://rt.perl.org/rt3/Ticket/Display.html?id=107726
"Filter::Simple with immediately following "no""
Can anyone say why this distribution is distributed with Perl?
Other than its own tests, I can't find any place in the core distro
where it is used. While I can recall Damian Conway's presentations
about it half a decade ago, I can't say I've ever had a use for it.
Which makes me wonder whether or not this is a good candidate for
transfer to "maintained-only-on-CPAN" status (note: *not* dual-life status).
Thank you very much.
Jim Keenan